Keystones — Lintel
Five GCSE retrieval questions · 26 March 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000081 in standard form
Answer: 8.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 16x + 64
Answer: (x + 8)(x + 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.78cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 2:7:12. What fraction of the counters are pink?
Answer: 4⁄7 -
5. Statistics Mean
Calculate the mean of: 36, 6, 50, 10, 36, 30, 16. Give your answer to 2 decimal places
Answer: 26.29